Steel for non-magnetic drilling tool and production method thereof
A production method and technology for drilling tools, which are applied in the fields of forging and steelmaking, can solve the problems of reducing the solubility of nitrogen in steel, reducing the resistance to intergranular corrosion of steel, and other problems.
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[0046] The technical scheme of the present invention is described below with specific examples, but protection scope of the present invention is not limited thereto:
[0047] Smelting non-magnetic stainless steel of the present invention (steel 1, steel 2, steel 3, steel 4) and comparative steel (comparative steel 1 and comparative steel 2) in the argon oxygen furnace, chemical composition is shown in Table 4, casts 3.5 tons of steel ingots, is heated to Open billet forging at 1080℃, billet forging ratio 5, forging into Φ280mm forgings, air cooling to deformation strengthening temperature, deformation strengthening, air cooling, air cooling or water cooling to room temperature after strengthening. Deformation strengthening process parameters and performance testing of forgings are shown in Table 5, and the meanings of the symbols in the table are:
[0048] Ni equivalent = Ni+0.60Mn+0.18Cr+9.69(C+N)-0.11Si 2 , when Ni equivalent ≥ 16, it is marked as √, when Ni equivalent < 16...
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